Keyboard



FIG. 1 is a top view of a keyboard showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom view thereof. 

The ornamental design for a keyboard, as shown. 